Grinding apparatus.



J. A. BEGHTEL. GRINDING APPARATUS. APPLIflATlUN FILED AUG.14, 1912.

1,989,894, Patented Mar. 10, 1914,

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LVITNESSES" IN V EN TOR. W BY HQZUQW J. A. BECHTEL. GRINDING APPARATUS.APPLICATION FILED AUG. 14, 1012 1,()89,894 Patented Mar. 10, 1914 4SHEETB-SHEET 2 M NEY.

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W1 TNESSES: IN VEN'IOR.

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J. A. BEGHTEL.

GRINDING APPARATUS.

APPLICATION FILED AUG. 14, 1912.

PatenteduMar. 10, 1914.

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be capable of UNITED sTAtrns PATENT OFFICE.

JOHN A. IBECHTEL, 0F TARENTUM, PENNSYLVANIA, ASSIGNOR '10 PITTSBURGHPLATE GLASS COMPANY, OF PITTSBURGH, SYLVANIA.

PENNSYLVANIA, A. CORPORATION OF PENN- GRINDING APPARATUS.

Specification of Letters Patent.

Patented Mar. 10,1914- Application filed August 14, 1912. Serial No.715,126.

To all whom it may concern:

. Be it known that I, J 01m A. Bnonrnn, a citizen of the United States,residing at Tarentum, in the'county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inGrinding Apparatus, of which the following is a specification.

The invention relates to grinding apparatus. It has for its primaryobjects the provision of a simple apparatus which shall supplying one ormore grinding machines with the exact kind of abrasive required for theoperation then in progress while still keeping the other grades ofabrasive in such condition as to be ready for '--nnediate application toany one of the g' inding machines as the occasion may require, thusenabling the abrasive to be used to the best advantage; the provision ofa system of the character specified for the circulation of the abradingmaterial such as will serve to-equalize the capacitics of continuously.

employed; the provision the grading apparatus for all of the grades of asystem wherein the used and new material in the grades not suitable forthe work being done at any particular time is separated and held inreadiness for future operations; the provision of an apparatus sim le inconstruction and compact in form w ierein the abrasive employed may beused repeatedly and with practically no waste; the provision ofanapparatus wherein any desired grade of abrasive may be supplied to agrinding mechanism without interfering with the other grades held readyfor use by the apparatus, or being used with other grinding mechanisms,and the provision of an apparatus which may be operated substantiallyOne embodiment of the invention is shown in the accompanying drawingswherein-- Figure 1 is a plan view showing the general arrangement of theapparatus; Fig. 2 is-a side elevation of a portionof the apparatus, withcertain of the parts thereof in section; Fig. 3 is a transverse sectionon the line III-+111 of Fig. 2; Fig. l is a side elevation of theapparatus, with certain of the parts partially broken away to morelnarlv show the structure; and Fig. 5 is an end elevation of theapparatus shown in Fig. 4. I

Referring first to the general arrangement of parts as shown in Figs. 1and 2, A, A are grinding tables which may be of any approved type anddriven in the usual manner; B, B and C, C employed in the grindingofplate glass, which runners are of the usual construction and supportedin the usual way; D, D are the troughs or drainage receptacles lyingbeneath and encircling the outer edges of the grinding tables andadapted to receive the mixture of sand and water from such 'tablesduring the grinding operation; E is the tank for separating the sandemployed in grinding, into a plurality of ditlerent grades for use inseries during the difl'erent stages of the grinding process; F is adrainage pit or sump to which the mixture of sand and water from thetroughs D, D is conducted through the passages G; H is a rotary pump forcarrying the mixture of sand and water in the sump F to the grading tankE; H is a bin containing fresh sand which is adapted to be supplied fromtime to time from the bottom of the bin to the sump F through the doorI; and K, K are troughs leading from the grading apparatus to the twogrinding mechanisms, such troughs communicating at their lower ends withtransverse conductors L perforated on their lower sides and extendingacross the grinding tables so as to supply the mixture of sand and wateruniformly over such tables. In the arrangement just described, one'grading apparatus is illustrated as taking care of two sets of grindingmechanism, but it will be understood that this arrangement is merelyillustrative, and that the grading mechanism may be used with anydesired number of grinding mechanisms-depending upon its capacity. In 0eration the material supplied through tiie troughs K to the grindingtables after use upon such tables is drained into the troughs D andreturns to the pit or sump F from which it is pumped to the grading tankE by means of the pump H, so that the material is used over and overagain, the material too fine for use being washed out over the top ofthe tank as hereinafter described, and

are the runners ordinarilyend of the grading tank E.

fresh sand being supplied from the bin 1% from time to time to take theplace of the small quantity of sand which. is wasted or which becomesbroken up into particles too fine for reuse.

'The character of the grading apparatus will be readily understood byreference to Figs. l and The lower portion 1 'of the grading tank E isconical in form, while the upper portion 2 thereof is cylindrical. Thepump H is driven from a motor 8 (Fig. such pump iii being provided withan inlet pipe t for carrying the material to be graded, from the sump Fto the pump, and has an outlet pipe 5 leading into the lower In the formof apparatus illustrated, two sets oi pipes 6 and 7 lead from differentlevels in the conical portion of the tank and have connected to theirouter ends which lead through the sides of the tank, the flexible pipesS and 9. Either or both of the pipes 8 and 9 may be directed into thetroughs K leading to the grinding mechanisms. The other flexible pipe orpipes which do not lead to the troughs K discharge into the boxes 10provided with pipes 11 leading back into the' grinding is first begun,the flexible pipe 8 sump- F. Suspended in the cylindrical portion 2 ofthe tank are a pair of flexible tubes 12, which tubes are open at theirupper ends and at their lower ends pass through the side of the tank andcarry the flexible tubes 13. These flexible tubes 1 can be made todischarge either into the troughs K or into the boxes 10. The tubes aresuspended by means of the cords 13 pa .ng over the pulleys 1 1, thelower end of each of the cords 13 being provided with a chain 15 whichmay be made to engage securing device (not shown) whereby the upper endsof the flexible pipes 12 may be held at any desired elevation. Anoverflow opening 16 is provided adjacent the upper edge of the tank,from which opening a pipe 12 t 5) conducts the waste material such asmud and sand too fine for use, to the sewer or some'othcr wastereceptacle.

Intermediate the ends of the cylindrical portions 2 of the tank isanoutlet pipe 18 extending down into the tank as i dicated in dotted linesand'governed byv th "valve '19 and lending to the trough 20 are twobranches 21. This trough 20 surrounding the tank is provided with apairotdischarge pipes 22, which discharge pipes, as indicated 1 in Fig.1, lead to Lhelroughs or ditches D, D underneath the tables and serve aiunc-- tion to be hereinafter described.

As indicatedd-n Fig. 3, the boti g'in of the sand bin 11f.- formed withconverging wallsz23,-23, a d the joining edges of these sides slopetoward the sump l as indicated in Fig. 2. .Byjmcans of this arrangement,the sand in thebije may be readily conducted to the sump, such passagebeing controlled by means of a sliding door l. in order to facilitatethe inrwement of the sand down the inclined bottom of the bin, the pipes26 are provided along the'inclined sides of the bottom as indicated in.liig. 3, and a third pipe 27 extends along the extreme lower the bin.These pipes are supplied Vi water outlets and by this means the feeding;ofthe sand out of the bin and to the sump l is reuily Facilitated, andall of the sand in the bin may be fed out without diiii- The small checkvalve '28 governs the 6 at the lower end (it the draining 1 small valvebeing operated by the mp0 29 extending over the shown.

got llcvs will be sen th: t when the pump is epcon iccted to the pipe 8is introduced into the trough ii, the other pipes 9 and 13 carryingtheiiner grades of send and being in position so as to discharge into thebox 10. Wluni the grinding has progressed for a given tim and a iincrgrade of sand required, the pipe or hose 8 is withdrawn from the troughi and the pipe or hose 9 inserted in such trough. After the grindingwith this particular grade has been concluded, the upper end of the pipeor hose i2 is low ered to a position adjacent the lower end of thecylindrical part 2 of the tank or to a. level in the tank occupied bythe exact grade progresses and finer and finer grades of sand erereqinred, toe pipe 12 is raised. step by step by means of chain 15 attheend of cord 13 until the finest grade of sand is used,

and the grinding operation is concluded.

The several links in chain not oniy serve to secure pipe 1.2 in theproper position by.

engaging; with seep not shown bus it also enables the L r to determinethe exact position the kite end or? pipe 1211 the grading app ratus sohp thereby knows the i xact of abrasive being delivered to the grindingmechanism atany stage of the operation. a

It is desirable during the operation as just described that the upwardvelocity in the tank may be such that none of the sand suitable for useshall washed through the outlet 16, and. in order to regulate thisupward velocity of the water through the upper portion of the tank andprevent a waste of anyof the grinding sand, the outlet pipe 18controlled by the valve 19 is provided. The opening of this valve 19reduces the upward velocity of the water in the tank above the lower endof the pipe 18 to such an extent that only the mud and those, portionsof the sand unsuitable for grinding are washed away through the overflow17. The mixture thus withdrawn through the outlet 18 passes through thetrough 20 and thence through the pipe to the trough or gutter D (seeFig. 1), and thence back to the sump F. The material thus withdrawn istherefore not wasted, but is returned for use, and the returning of themixture to the gutter l) performs a useful function in that it assistsin 'ashing out the gutter and keeping it clean, thus reducing oreliminating the amount of clean water which would otherwise have to befurnished to the gutter in order to wash it out. The mixture of tinesand and water, because of its specific gravity, constitutes a betterwashing medium for the coarse sand in the trough than clear water. Theplacing of the valvell9. above the inle 'to the pipe 18 is advantageousin that the head of waterat the valve 1%) and its velocity, is reduced,thus rer'lucing the cutting action of the sand on the valve. Similarlythe use of the trough 20 is advantageous as the pipes '21. dischargeinto such trough at relatively low velocity, whereas if such pipes wereconnected directly with the pipe 22, the suction from such pipe 22, dueto the added head, wolild increase the velocity of flow past the'valve19 and the consequent cutting action of the sand.

It, will be seen from the foregoing that the operation of the apparatusis substan tially continuous and that the amount. of waste is reduced toa minimum. Any desired grade of sand may be withdrawn from the tank atany time, without disturbing the grades above or below the point ofwithdrawal and the apparatus is always in condition for use. \Vhenlhegrinding mechanism is not being operated, all of the pipes or hose 8, t)and 13 discharge into the box 10, and the material is returned to thesump F and again circulated through the apparatus. The pump II may thusbe made to operate continuously, regardless of the operation ofthe'grindingmechanism, and as a result, the sand in the water ismaintained continuously in suspension, and there is no clogging of theparts due to the settling of the sand.

"It will also be readily understood that no matter whether one or moregrinders-are In operation or whether no grinder at all'is in operation,the discharge tromthe various pipes leading from the gradingxtankremains constant, thus Illsdllllg the same upward of the regulatingvalve 19, it

velocities in all of the horizontal planes in the grading tank 0 that.irrespective of the character of the work that is being done, thevarious grades will always lie at approximately the same position in thegrading apparatus, thus insuring a uniformity of op eration not easilyotherwise obtained.

It will also be apparent that due to the small capacity of the lowerpart of the conieal portion of the cone, the capacity of the grader tohold the larger grades or coarser particles is cmnparatively small inproportion to that part of the grading apparatus which holds the linerportions of grading material; but, in as much as these coarser gradesare continuously discharging from the, lower portion of the cones intothe sump l", the capacity of the system to hold the lower grades isincreased by the capacity of the sump F. This increase of the ea-'pacity ol the system is very :ulvantageous as it enables the apparatus,to be operated under widely varying conditions as regards the amount ofcoarse sand that is introduced into the system from the bin ll. If itwere not for this feature of the apparatus and too great a quantityof'saud was introduced into the system, itwould all accumulate in thebottom part of the grader E and seri cusly interfere with its operation.On the other hand the upper portion of the tank above acts as acollector or trap for fine sand, such fine sand accmnnlating until thedesired proportion of sand to water necessary for the best results ingrinding is secured. This upper portion of the tank thu's constitutes asupplemental grade; superposed upon the lower part of the tank.

l urthermore, the labor of getting the sand into suspension againineulent to an intermittent operation is eliminated, and the apparatusis in condition for operation just as soon as thegrinding mechanism isin shape to receive the sand. Another advantage incident to theapparatus is due to the fact that a plurality of grinding mechanisms maybe fed from the same grading apparatus, and this operation nay becarried on whether the stage of grinding is the same in the variousgrinding mechanisms or not; that is, rough grinding may be carried on inone grinding n'ieehanism while fine grinding is being carried on inanother mechanism, such function being incident to the fact that onegrade may be withdrawn from the apparatus withou interfering with theposition of another grade.

incident to the use will be seen that the use of this valve permits anydesired upward velocity of fluid in the tank below the lower end of thepipe 18 without increasing the velocity above such lower end or withoutwashing away any of the sand suitable for use through the overflow16.180

As a further function other grades in'suspension tacle to the gradingdevice,

3. The combination with a grinding mechanism employing a llllXlIilXQOfabrasive and water. and a dralnage rcceptacle be neath the grindingmechanism for receivmg the said mixture from such grinding mechanismafter use therewith, ot' a grading device adapted to separate theabrasive in the said mixture into a plurality ot diti'erent grades,means for conducting the mixture of abrasive and water from thereceptacle to the grading device, means whereby any one of the grades inthe grading device may be conducted from the grading device to thegrinding mechanism in the grading device, and means for returning aportion of such other grades to the drainage receptacle during theapplication of the one grade to the grinding mechanism. 4. Thecombination with I a grinding mechanism employing a mixture of abrasiveandwater, and a drainage receptacle beneath the grinding mechanism forreceiving the said mixture from such grinding mechanism after usetherewith, of a grading device adapted to grade the abrasive in the saidmixture, means for conducting the mixture of abrasive and water from therecepand a conductor leading to the grinding mechan sm an movablevertically in the grading ,device whereby any one ofthe grades thereinmay be withdrawn and delivered to toe grinding mechanism withoutwithdrawing the other grades.

5. The combination with a grinding mechanism employing a mixture ofabrasive and water, and a d'ainagc receptacle for receiving the saidmixture from the grinding mechanisnnof a grading tank, means for forcingthe mixture receptacle upward through the tank, an overflow passageleading from the tank, a conductor for carrying the niaterizl gradedfrom the tank to the grinding mechanism, and a regulating passageintermediate the ends of the tank and leading back to the drainagereceptacle, whereby the amount of overflow and the upward velocity ofthe liquid in the tank above the outlet from the tank of such lastpassage may be regulated.

6. The combination with a grinding mechanism having a table andemploying a mixture of abrasive and water, of a drainage trough inposition, to receive the discharge-from the table, a sump for receivingthe mixture from the trough, a grading tank, means for forcing themixture from the sump upward through the grading tank, an overflowpassage leading from the tank, a conductor for carrying the materialgraded from the tank to the grinding mech anism, a passage leading fromthe tank intermediate its ends t he said trough, an

while maintaining the from the drainage in the said last passage and theupward velocity of the liquid in the tank above the outlet of suchpassage may be regulated.

7. The combination with a grinding mechanism employing a mixture ofabrasive and'water, and a drainage receptacle for receiving the' saidmixture from the grind ing mechanism, of a grading tank, means forforcing the mixture from the drainage. receptacle upward through thetank, an overflow passage leading from the tank, a conductor for carryig the material graded from the tank to the grinding mechanism, a passageleading from the tank intermediate its .ends to the drainage receptacle,a regulating means in the said last passage whereby the amount ofoverflow and the upward velocity of the liquid in the a regulating meanswhereby the amount of overflow in the tank above the said outlet of suchpassage may be withdrawn from the tank.

he combination with a grinding mechanism employing a mixture of abrasiveand water, and a sump for receiving the drainage from the said grindingmechanism, of a grading deviceadapted to grade the abrasive in the saidmixture, means for conducting the mixture 'of abrasive and water fromthe sump to the grading device, and means whereby the mixture ofabrasive and water may be conducted from the grading device either tothe grinding mechanism or'back to the sump and circulated in anuninterrupted cycle without passing to the grinding mechanism.

9. The combination with a grindingmechanism employing a mixture ofabrasive and water, and a sump for receiving the drainage from y thesaid grinding mechanism, of a. grading device adapted to grade theabrasive in the said mixture, means for conducting the mixture ofabrasiveand water from the sump to the grading device, means whereby oneof the grades in the gradingdevice may be conducted from the gradingevice to the grinding mechanism without disturbing the other grades, andmeans wllereby such other grades are continuously circulatedfromthegrading device to the sump and back to the grading device againwithout passing to the grinding mechanism.

10. The combination with a mechanism employing a mixture of abrasive andwater, and a drainage receptacle for re eeiving the said mixture fromthe grinding mechanism, of a grading tankymeans for forcing the mixturefrom the drainage re- 125 ceptacle upward through the tank, an over flowpassage leading from the tank, a conductor for carrying the materialgraded from the tankto the grinding mechanism, a.

tank intermediate 13o passage leading from the grinding ceivei' to thedrainage receptacle, said" passage serving to reduce the amount oioverflow a'nd' i-he upward veiocity of the liquid in the hank above sheeuitlet i'om Zhe tankof the said passage. 4

11. The combination with a grinding mechanism ern cloying s mixture 03:ab n'sive and water, and a drainage receptacle for re ceiving the saidmixiure from the grinding mechanism, of a grading tank, means forforcing the mixture from the drainage receptacie upward through thetank, an overflow passage leading from i'he sank, con doctor forcarrying the material graded from the tank to the grinding mechrmisni,passage leading from the tank intermediate its ends; the said extendingup Wind and then downward and discharging to the drainage receptacle,and a regulating velve at the u 3 er 1 onion of such iesi; ms-

age for governing the flow therethrough.

12. The combination with a grinding mechanism employing a mixture ofabrasive and Water, and e sump for receiving the drainage from the saidgrinding mechanism.

of a grading device adapted ito grade the abrasive 1n the said nnxtui e,means i'ocon ducting the inixhure of abrasive undimier from the. sump tothe grading device, means for conducting the graded niixeui'c to thegrinding mechanism, a bin having; a hopper bottom adjacent the sump, andpipes with outlets adjacent, such bottom for washing the sa'nd'in thebin to the sump.

vl3. The combination with a plurality of grinding mechanisms employing amixture of abrasive Water und menns for coilecsing the drainagetherefrom, of a single grading device adapted. to separate 'i-hcabrasive in the said mixture into a plurality of diferenb grades, meansfor continuously condnc zing the drainage from the said grindingmechanisms to the grading device, means. wher b any one of the grades inthe grading device may be conducted to any one of she said" grindingmecha isms, and means whereby other grades in the grader may besimultaneously conducted either to other of the grinding; mechanisms orto the means for collecting the drainage Without passing to izhegi-inding mechanisms.

"14-. The combination with a plurality of.55

grinding mechanisms employing a mixture of abrasive and water and meansfor col" lecting the drainage therefrom, of a single grading deviceadapted to separate the abrasive in the said mixture intoe plurality Ioi chiieient grades, means ior continuously,

conducting the drainage from the said grinding mechanisms to the gradingdevice, means whereby one ofthe grades in the grading device may beconducted to one of the grinding mechanisms without disturbing the othergrades in the grading device, and means whereby a different grade may besiinuliencously conducted so another grinding mechanism Withoutdisturbing the other 7 grades in the grader, e continuous-finduniEELQfTUpiECl cii'cuietion of the two grades to ti) grinalingmechanisms and back to the grading device being maintained, and themixture returned to the grader serving to gisde the mixture in thegrading device.

in iesiirnony whereof I have hereunto signed my name in the presence ofthe two subscribed witnesses.

JOHN A. BECHTEL.

Vii-1 t Lu'ii'iim A. hiYnRS, inoi-ii'vozi'iii MARTIN.

